From d74f8fc584e12c7f9e39042963341345af3bdab6 Mon Sep 17 00:00:00 2001
From: Alex Kotov <kotovalexarian@gmail.com>
Date: Wed, 25 Jan 2023 19:27:20 +0400
Subject: [PATCH] Add some functions

---
 20230125142000_functions.down.sql |  4 ++++
 20230125142000_functions.up.sql   | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)
 create mode 100644 20230125142000_functions.down.sql
 create mode 100644 20230125142000_functions.up.sql

diff --git a/20230125142000_functions.down.sql b/20230125142000_functions.down.sql
new file mode 100644
index 0000000..a15c7a7
--- /dev/null
+++ b/20230125142000_functions.down.sql
@@ -0,0 +1,4 @@
+BEGIN;
+DROP FUNCTION is_name;
+DROP FUNCTION is_language_code;
+COMMIT;
diff --git a/20230125142000_functions.up.sql b/20230125142000_functions.up.sql
new file mode 100644
index 0000000..aa3238c
--- /dev/null
+++ b/20230125142000_functions.up.sql
@@ -0,0 +1,16 @@
+BEGIN;
+
+CREATE FUNCTION is_name(value TEXT) RETURNS BOOLEAN LANGUAGE plpgsql AS $$
+BEGIN
+    RETURN value = btrim(value) AND length(value) > 0;
+END;
+$$;
+
+CREATE FUNCTION is_language_code(value VARCHAR) RETURNS BOOLEAN LANGUAGE plpgsql
+AS $$
+BEGIN
+    RETURN value ~ '^[a-z]{2}$';
+END;
+$$;
+
+COMMIT;